My Git repository merging functionality
is at the heart of Team Foundation
Server's pull request feature.
In addition, I developed the Git
protocol handling functionality
for fetching and pulling over HTTP.

Team Explorer Everywhere is a cross-platform suite of clients for
Microsoft Team Foundation Server, including a standalone client,
a plug-in for the Eclipse IDE and a command line client. (Formerly Teamprise Client Suite.)

Remote Accelerator is a single-user version
control proxy for Team Foundation Server.
It is optimized for a single developer
working remote from the server, and
includes a clever cache seeding
technology to keep the cache pre-filled.

Vault is a version control tool which was designed to be a compelling
replacement for Visual SourceSafe. Vault provides advanced version control
operations including atomic transactions and rename support while retaining
a light footprint and tight support to Microsoft Visual Studio.

SOS Collab is a remote access front-end for Visual SourceSafe with integrated
bug tracking and team collaboration tools. The collaborative features have
since been moved to a separate product,
Dragnet,
which integrates with both SourceOffSite and Vault.

My then-coworker, Dan Brumleve, came up with the idea of
a web-based front-end to Mathematica, and wrote
the initial version of The Integrator. I rewrote it to
become the second generation.
It still lives, but fortunately using webMathematica
instead of any code I wrote.

NCSA CSD was a front-end for searching the
Cambridge
Structural Database of organic compounds and creating
molecular representations that could be visualized using
MacMolecule in 3D ball-and-stick representations.

NCSA Waltz is a front-end to
NCSA DISCO,
which itself was an application for computing electron density of molecules
back when you needed supercomputers to run Schroedinger's equation.
Amusingly, NCSA DISCO doesn't exist anymore; this is all done by
PC-GAMESS on a puny Linux box.